Karatas, FERHAT
I would love to change the world, but they won't give me the source code!
Defining an Interface
28.02.2007 11:53:37 - Filed under : Java
An interface declaration consists of modifiers, the keyword interface, the interface name, a comma-separated list of parent interfaces (if any), and the interface body. For example:
public interface GroupedInterface extends Interface1,Interface2, Interface3 {
       // constant declarations
       double E = 2.718282;  // base of natural logarithms

       // method signatures
       void doSomething (int i, double x);
       int doSomethingElse(String s);
 }
The public access specifier indicates that the interface can be used by any class in any package. If you do not specify that the interface is public, your interface will be accessible only to classes defined in the same package as the interface.

An interface can extend other interfaces, just as a class can extend or subclass another class.
However, whereas a class can extend only one other class, an interface can extend any number of interfaces.
The interface declaration includes a comma-separated list of all the interfaces that it extends.

The interface body contains method declarations for all the methods included in the interface. A method declaration within an interface is followed by a semicolon, but no braces, because an interface does not provide implementations for the methods declared within it. All methods declared in an interface are implicitly public, so the public modifier can be omitted.

An interface can contain constant declarations in addition to method declarations. All constant values defined in an interface are implicitly public, static, and final. Once again, these modifiers can be omitted.

Keywords : Interface; can extend other interfaces, does not provide implementations, a class that implements an interface must implement all the methods declared in the interface.
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